The client had to connect with a submarine high voltage cable several offshore wind turbine farms. Normally every wind farm had an own offshore HV-platform. It was calculated that an artificial island was a more smart investment in a public domain. The problem was that only limited contractors were capable for this job. Added with the fact that every contractor had his own working methods and approach in land reclamation. This belonged to the intellectual property of the contractor, and could not be transferred. The design of the island had also an impact on the yearly maintenance costs. Blue Chain was asked to follow the EU-procedure for this investment of 300mio€. The balancing between capex/opex was very important, but also to find the best technical solution. A separate EU-procedure was launched to find an owner’s engineer. Blue Chain and the owner’s engineer selected the best technical solution. The selection was done in multi-stages, because the convergence process was key in the final sustainable solution. Due to the fact that the government reduced the public financing, the project had to stop. The learnings of this tendering track were also used for other key public tenders.